{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The flexibility may occur in the positioning of the transcription bubble prior to RNA synthesis and may reflect bubble expansion ( \" scrunching \" ) or bubble contraction ( \" unscrunching \" ) ."}
{"Chemical": []}